US5206132AExpiredUtility

Direct positive silver halide photographic light-sensitive material

65
Assignee: KONISHIROKU PHOTO INDPriority: May 14, 1990Filed: May 3, 1991Granted: Apr 27, 1993
Est. expiryMay 14, 2010(expired)· nominal 20-yr term from priority
G03C 1/48515Y10S430/164G03C 1/485
65
PatentIndex Score
6
Cited by
5
References
5
Claims

Abstract

A direct positive silver halide photographic light-sensitive material which is improved in gradation and suitable for rapid processing comprises a support having thereon a silver halide emulsion layer containing surface-fogged type direct positive silver halide grains, wherein said direct positive silver halide emulsion layer comprises two or more silver halide emulsions substantially different in sensitivity and/or gradation; the ratio of the total area of (111) face to and total surface area of grains in said emulsions is not less than 50%; and the average silver iodide content of grains in said emulsions is not more than 5 mol%.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A direct positive silver halide photographic light-sensitive material comprising a support having thereon a silver halide emulsion layer containing surface-fogged type direct positive silver halide grains, wherein said direct positive silver halide emulsion layer comprises two or more silver halide emulsions substantially different in sensitivity and/or gradation; the ratio of the total area of (111) face to the total surface area of grains in said emulsions is not less than 50%; the average silver iodide content of grains in said emulsions is not more than 5 mol %; and wherein said photographic material is processed with an automatic processing machine for an overall processing time of more than 20 seconds and less than 60 seconds. 
     
     
       2. A photographic material of claim 1, wherein said area ratio of (111) face is not less than 70%. 
     
     
       3. A photographic material of claim 2, wherein said ratio is not less than 80%. 
     
     
       4. A photographic material of claim 1, wherein said silver iodide content is not more than 2 mol %. 
     
     
       5. A photographic material of claim 1, wherein said silver halide grains contain an inorganic densitizer of rhodium salts and/or iridium salts in an amount of 10 -8  to 10 -2  mol per mol of silver halide.

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